using System;
using System.Windows.Forms;
using CSW.Framework.Common;
using CSW.Framework.UI.Binding;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Controls;

namespace CSW.Framework.UI.DevEx.Binding
{
    /// <summary>
    /// A wrapper class for binding <see cref="ComboBoxEdit"/> objects with <see cref="Binder"/>.
    /// </summary>
    public class BindableComboBoxEditBoolean : IBindableControl
    {
        private readonly ComboBoxEdit m_ComboBoxEdit;
        private readonly string m_TrueString;
        private readonly string m_FalseString;
        private readonly bool m_AllowNull;

        /// <summary>
        /// Initializes a new instance of the <see cref="BindableComboBoxEditBoolean"/> class.
        /// </summary>
        /// <param name="comboBoxEdit">The ComboBoxEdit.</param>
        public BindableComboBoxEditBoolean(ComboBoxEdit comboBoxEdit)
            : this (comboBoxEdit, false)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="BindableComboBoxEditBoolean"/> class.
        /// </summary>
        /// <param name="comboBoxEdit">The ComboBoxEdit.</param>
        /// <param name="allowNull">if set to <c>true</c>, allow null input (default = false).</param>
        public BindableComboBoxEditBoolean(ComboBoxEdit comboBoxEdit, bool allowNull)
            : this(comboBoxEdit, "Yes", "No", allowNull)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="BindableComboBoxEditBoolean"/> class.
        /// </summary>
        /// <param name="comboBoxEdit">The ComboBoxEdit.</param>
        /// <param name="trueString">The true string.</param>
        /// <param name="falseString">The false string.</param>
        public BindableComboBoxEditBoolean(ComboBoxEdit comboBoxEdit, string trueString, string falseString)
            : this(comboBoxEdit, trueString, falseString, false)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="BindableComboBoxEditBoolean"/> class.
        /// </summary>
        /// <param name="comboBoxEdit">The ComboBoxEdit.</param>
        /// <param name="trueString">The true string.</param>
        /// <param name="falseString">The false string.</param>
        /// <param name="allowNull">if set to <c>true</c>, allow null input (default = false).</param>
        public BindableComboBoxEditBoolean(ComboBoxEdit comboBoxEdit, string trueString, string falseString, bool allowNull)
        {
            Guard.ArgumentNotNull(comboBoxEdit, "comboBoxEdit");

            m_TrueString = trueString;
            m_FalseString = falseString;
            m_AllowNull = allowNull;

            m_ComboBoxEdit = comboBoxEdit;
            m_ComboBoxEdit.Validated += ComboBoxEdit_Validated;
            m_ComboBoxEdit.SelectedIndexChanged += ComboBoxEdit_Validated;
            m_ComboBoxEdit.Properties.TextEditStyle = TextEditStyles.DisableTextEditor;

            m_ComboBoxEdit.Properties.Items.Clear();
            m_ComboBoxEdit.Properties.Items.Add(m_TrueString);
            m_ComboBoxEdit.Properties.Items.Add(m_FalseString);

            if (m_AllowNull)
            {
                // Search for butotn
                bool found = false;
                foreach (EditorButton button in m_ComboBoxEdit.Properties.Buttons)
                {
                    if (button.Kind == ButtonPredefines.Delete)
                    {
                        found = true;
                        break;
                    }
                }

                // If not found, add
                if (!found)
                    m_ComboBoxEdit.Properties.Buttons.Add(new EditorButton(ButtonPredefines.Delete));

                // Handle click
                m_ComboBoxEdit.ButtonClick += BaseEditEventHandlers.DeleteButtonClick;
                m_ComboBoxEdit.KeyDown += BaseEditEventHandlers.DeleteKeyDown;
            }
        }

        private void ComboBoxEdit_Validated(object sender, EventArgs e)
        {
            EventHandler tmpValidated = Validated;
            if (tmpValidated != null)
            {
                tmpValidated(sender, e);
            }
        }

        #region IBindableControl Members

        /// <summary>
        /// Occurs when the control has validated.
        /// </summary>
        public event EventHandler Validated;

        /// <summary>
        /// Sends the <see cref="Validated"/> event.
        /// </summary>
        public void SendValidated()
        {
            EventHandler validated = Validated;
            if (validated != null)
                validated(this, EventArgs.Empty);
        }

        /// <summary>
        /// Gets the control this object wraps.
        /// </summary>
        /// <value>The control this object wraps.</value>
        public Control Control
        {
            get { return m_ComboBoxEdit; }
        }

        /// <summary>
        /// Gets or sets the value of the control.
        /// </summary>
        /// <value>The value of the control.</value>
        public object Value
        {
            get 
            {
                if (m_ComboBoxEdit.SelectedIndex == -1 && m_AllowNull)
                    return null;
                else
                    return m_ComboBoxEdit.SelectedItem.Equals(m_TrueString); 
            }
            set 
            {
                if (value == null)
                    if (m_AllowNull)
                        m_ComboBoxEdit.SelectedIndex = -1;
                    else
                        throw new ArgumentNullException("value", "Value does not accept null.");
                else
                    m_ComboBoxEdit.SelectedIndex = (value.Equals(true) ? 0 : 1); 
            }
        }

        /// <summary>
        /// Gets the name of the control.
        /// </summary>
        /// <value>The name of the control.</value>
        public string Name
        {
            get { return m_ComboBoxEdit.Name; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the control is enabled.
        /// </summary>
        /// <value><c>true</c> if enabled; otherwise, <c>false</c>.</value>
        public bool Enabled
        {
            get { return m_ComboBoxEdit.Enabled; }
            set { m_ComboBoxEdit.Enabled = value; }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the control is read only.
        /// </summary>
        /// <value><c>true</c> if read only; otherwise, <c>false</c>.</value>
        public bool ReadOnly
        {
            get { return m_ComboBoxEdit.Properties.ReadOnly; }
            set 
            { 
                m_ComboBoxEdit.Properties.ReadOnly = value;
                m_ComboBoxEdit.TabStop = !value;

                foreach (EditorButton button in m_ComboBoxEdit.Properties.Buttons)
                {
                    button.Enabled = !value;
                }
            }
        }

        /// <summary>
        /// Focuses the control.
        /// </summary>
        public void Focus()
        {
            m_ComboBoxEdit.Focus();
        }

        /// <summary>
        /// Gets the tab index.
        /// </summary>
        /// <value>The tab index.</value>
        public int TabIndex
        {
            get { return m_ComboBoxEdit.TabIndex; }
        }

        /// <summary>
        /// Gets or sets the maximum string length.
        /// </summary>
        /// <value>The maximum string length.</value>
        public int MaxLength
        {
            get { throw new NotSupportedException("MaxLength is not supported."); }
            set { throw new NotSupportedException("MaxLength is not supported."); }
        }

        #endregion

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            Validated = null;
            m_ComboBoxEdit.Validated -= ComboBoxEdit_Validated;
            m_ComboBoxEdit.SelectedIndexChanged -= ComboBoxEdit_Validated;
            m_ComboBoxEdit.ButtonClick -= BaseEditEventHandlers.DeleteButtonClick;
            m_ComboBoxEdit.KeyDown -= BaseEditEventHandlers.DeleteKeyDown;
        }
    }
}